Hey, I'm a current DO student and have many friends who did the MBS program. Basically, if you meet all of the requirements and you're nice you'll get in. It's not "gauranteed" only because they still need to reserve the right to screen for red flags (i.e. 1) Personality not suitable for medicine or 2) Academic and/or MCAT performance showing that you may not be able to get through medical school). Hope that answers your question.
Ex. If after a year of MBS you take/retake the MCAT and get a 492, you still wouldn't get in.
Actually after looking at the website, it's exactly the way it's laid out on there.